If a lighting designer asks you to "Flag" a light, what should you do?

When a lighting designer requests to "flag" a light, they are asking you to obstruct the beam of light to control its visibility or intensity, which is often achieved by waving a hand or a flag in front of the luminaire. This action serves to momentarily cut off or modify the light output, helping to shape the light for a specific artistic effect or eliminate a spill that may be unnecessary for the current scene.

In this context, waving a hand in front of the light acts as a practical and immediate method to simulate what it would be like to have a physical flag or gobo in place, allowing the designer to visualize or test the lighting arrangement without making permanent changes. Understanding this terminology is crucial for effective communication on set, as it conveys a clear intention in lighting manipulation.

The other choices involve actions that do not align with the intent of "flagging" a light: changing a bulb is related to maintenance, adjusting the focus modifies the directional angle of the light rather than controlling its presence, and turning off the light stops the illumination completely rather than manipulating it for artistic purposes.